body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: #f9f9f9;
  color: #333;
}

header {
  background: #0055a5;
  color: white;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav a {
  color: white;
  margin-left: 1rem;
  text-decoration: none;
  font-weight: bold;
}

main {
  padding: 2rem;
}

section {
  margin-bottom: 2rem;
}

footer {
  background: #e9e9e9;
  text-align: center;
  padding: 1rem;
}